I will use seven segment display to show the numbers, but I also must be
able to set a specific time by increasing/decreasing and then once it is
set, with another button the clock will start to go down.
signal lock is for preventing the count increases at the speed of the
manual is a button,
I guess the count up is okay, but the problem is when I want it to go
down. In the simulation when I put the sentido HIGH then I do not get
anything and does not work.

John wrote:> In the simulation when I put the sentido HIGH then I do not get anything
Absolutely NOTHING?
> and does not work.
What does your simulation show instead of the desired reaction?
What you built there is a combinatorial loop, because the Cs<=Cs-1
path has no clock!!11one!eleven!11
Where did you find this very strange way of a synchronous process? How
do it all the others around the world?
Try this and think about it: